package com.jahentao.patentQuery.web.shiro.jcaptcha;

import org.apache.shiro.web.filter.AccessControlFilter;
import org.apache.shiro.web.util.WebUtils;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

/**
 * 用于验证码验证的Shiro过滤器。
 */
public class JCaptchaValidateFilter extends AccessControlFilter {

	private boolean jcaptchaEbabled = true;// 是否开启验证码支持
	private String jcaptchaParam = "jcaptchaCode";// 前台提交的验证码参数名
	private String failureKeyAttribute = "shiroLoginFailure"; // 验证失败后存储到的属性名

	protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) throws Exception {

		// 1、设置验证码是否开启属性，页面可以根据该属性来决定是否显示验证码
		request.setAttribute("jcaptchaEbabled", jcaptchaEbabled);

		HttpServletRequest httpServletRequest = WebUtils.toHttp(request);
		// 2、判断验证码是否禁用 或不是表单提交（允许访问）
		if (!jcaptchaEbabled || !"post".equalsIgnoreCase(httpServletRequest.getMethod())) {
			return true;
		}
		// 3、此时是表单提交，验证验证码是否正确
		return JCaptcha.validateResponse(httpServletRequest,
				httpServletRequest.getParameter(jcaptchaParam));
	}

	protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {
		// 如果验证码失败了，存储失败key属性
		request.setAttribute(failureKeyAttribute, "jCaptcha.error");
		return true;
	}

	public void setJcaptchaEbabled(boolean jcaptchaEbabled) {
		this.jcaptchaEbabled = jcaptchaEbabled;
	}

	public void setJcaptchaParam(String jcaptchaParam) {
		this.jcaptchaParam = jcaptchaParam;
	}

	public void setFailureKeyAttribute(String failureKeyAttribute) {
		this.failureKeyAttribute = failureKeyAttribute;
	}
}